You can install anoth video card without turning th onboard video off, you will see the option to use the new video card in the windows display settings, if you do not hook a monitor up to the onboard video it will not use it either.

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try to power your board first see if the HDD light blicks .... if not turn off your computer remove your mem card clean the brass connector for your mem card using a pencil eraser and clean the mem card seats on the board using a brush then re-seat your mem card ... if stil not working replace your mem card with known good mem card if its ok replace your mem card

if theHDD light blink and no display check your video card clean your video card from dust build ups and also clean the brass connector using pencil eraser clean also the video card seat using a brush if your video card doesn't work have it replace

Follow your motherboard manual's instructions to enter the setup CMOS. look for the option that lists the on-board functions, such as video or graphic card. If your motherboard has the video card on-board, there will be an option to enable it or disable it. Set this option to "enable" if it isn't already. If your motherboard does not have on-board video, it must have a video card installed in that slot. In either case, if you have a monitor display when you turn on the computer, your video card IS enabled.

Unfortunately, as it sounds like a definite video problem, and the rdx200 has no onboard video, you will need to purchase a cheap test video card to test. I would look to newegg.com for a cheap PCI video card, just enough to get video on the board. you can then begin your testing.

Once you've obtained a cheap video card, if it boots and you receive video you at least know it is not the board itself. If you still get no video, the likelihood is you'll be purchasing a new motherboard for your system.

If you do get video, and you've had the system for only a year, it should still be under warranty. Check with the company you bought the system from for warranty and RMA (return merchandise authorization) procedures.

Turn the computer off.
Remove the PCI-E video-card.
Boot the computer.
Press DEL to "enter BIOS setup".
Disable the "onboard video" adapter,
or set the highest video-priority to be the PCI-E slot.
Save settings, but do not "exit" from BIOS setup.
Turn the computer off.
Install the PCI-E video-card.
Disconnect the video-cable from the onboard VGA-port,
and connect the video-cable to the new video-card.
Turn the computer on, and the video-output through the new video-card should be displayed on your monitor.

When you turn on the computer, it should say something like Press F2 to access setup/bios. Do that; there should be a setting to turn off the onboard video card. Varies by board, so I can't tell you exactly, but if you post your motherboard information, might be able to get you specifics.